Metal ion removal from water by sorption on paper mill sludge

• Published in: Chemosphere (Oxford) Vol. 51; no. 8; pp. 797 - 803
• Main Authors: Calace, N, Nardi, E, Petronio, B.M, Pietroletti, M, Tosti, G
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.06.2003; Elsevier
• Subjects: Applied sciences; Biological and physicochemical phenomena; Desorption; Exact sciences and technology; General purification processes; Industrial Waste; Ions; Metals; Metals, Heavy - chemistry; Metals, Heavy - isolation & purification; Natural water pollution; Paper mill sludge; Pollution; Refuse Disposal; Sorption; Waste Disposal, Fluid; Wastewaters; Water Pollutants - isolation & purification; Water Purification - methods; Water treatment and pollution; Sorption; Desorption; Metals; Paper mill sludge; Copper II; Cadmium; Water treatment; Liquid solid adsorption; Adsorption capacity; Heavy metal; Operating conditions; Paper industry; Industrial waste; Decontamination; Waste reuse; Lead; pH; Physicochemical purification; Water pollution; Adsorbent; Waste water purification; Mud; Silver I
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/S0045-6535(02)00864-0

Chromatographic columns packed with paper mill sludge are employed for metal ion recovery from water. The breakthrough curves show that cadmium, copper, lead and silver are removed from acid solutions (pH 2, 4); the affinity series is Pb(II)>Cu(II)>Ag(I)>Cd(II). Both the amount of metal retained and the metal–matrix interaction are pH dependent; the sorptive capacity increases with increasing pH. When the metals are present together at the same initial concentrations a competition among the different ions occurs although the affinity order remains unchanged. In metal recovery from the paper mill sludge column, the total amount of the cadmium and copper is displaced by HCl 1.0 M, 65% of the lead by HCl 0.1 M and 75% of the silver by HNO 3 0.1 M. More than 95% of copper and lead and less than 20% of cadmium were recovered with HCl 0.1 M when the metals were present at the same time.